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Quick Facts Date, Location ...

Battle of Sluis (1603)
Part of the Eighty Years' War
Battle of Sluis, from the Legermuseum, Delft
Date 26 May 1603 Location Sluis (present-day Netherlands) Result Dutch victory
Belligerents
United Provinces	Spain
Commanders and leaders
Joos de Moor	Federico Spinola †
Strength
3 men-of-war, 2 galleys, several minor vessels[1](Spanish source) 2 galleys, 2 smaller vessels.[2] Dutch source	8 galleys, 1,130 soldiers[1](Spanish source) 8 galleys, 4 smaller vessels[2](Dutch source)
Casualties and losses
50 dead or wounded no ships lost[2](Dutch source) 720 killed, 1 man-of-war sunk[3](Spanish source)	800 dead or wounded no ships lost[2](Dutch source) 414 killed[3](Spanish source)

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The Battle of Sluis was a naval battle during the Eighty Years' War in which a Spanish squadron commanded by the Italian captain Federico Spinola tried to break through a blockade of Sluis by Dutch ships under the command of Joos de Moor. After about two hours of fighting the heavily damaged Spanish ships returned to Sluis; Federico Spinola was killed during the action.